In past finals was there as much childish behaviour from the runners up and judges?

Nope.

There was a massive amount of churn in the Sam Attwater year after the final. Something to do with Chloe Madeley's tweets. Can't remember the details but it was pretty hilarious how everyone got their knickers in a knot over it.

Exactly and advertising shouldn't be allowed, however its a free country and rules are meant to be broken kinda thing. You shouldn't do it, but cannot always help yourself to do so.

Runners-up should know how to behave. When Clare Buckfield lost to Kyran Bracken, though outscoring him in the final, she said that she was grateful just to be there in the last two, to be able to do the Bolero.